在牙刷上放少量牙膏。

Put a small amount of ___toothpaste on the brush.

当我刷牙时，我用牙刷和一点牙膏。

When I brush my teeth, I use my toothbrush with a little ___toothpaste.

这款牙膏有助于预防蛀牙。

This ___toothpaste helps to prevent cavities.